bluntsgeli



2 Sheets- Sheet 1.

(No Model.)

T. ,BLUNTSGHLL MAGHNB POR GUTTNG AND POLISHING :PRECIOUS STONES, @5o.

N0. 399,006. l Patented Mar. 5, 1889.

N. PETERS. Pnwmmlwgnphnr, vlamingen", o c.

(No Model.) 2 sheets-sheen 2.

T. BLUN'I"SGHLI.

MACHINE POR GUTTNG AND POLISEING PRECIOUS STONES, dw. No. 399,006. Paten-ted'Mar. 5, 1889.

Inv@ nt ma` Witnesses, S/Qn'fk I M H1-ESS.

UNTTED STATES PATENT lllrrieEs l`,llE(`)D ')ll BLI'NTSCHLI, 0F SCHAFFllAVSl-PN, SVXITZERLAD.

MACHINE FR CUTTING AND POLlSl-HNG PRECEGUS STNS, ec.

SPECIFIOATION forming part of Letters Patent No. 399,006, dated March 5, 1889.

Application tiled December 30,

1886. Serial No. 223,021. (No model.) Patented in France July l, 1886, No. 177,126, and in Germany July 4,1886,No. 39,311.

Be it known that 1, THEoDoE lnnsfrson'ni, a citizen of Switzerland, residing at Schad'- hausen, in the Canton of Schaffhausen and Republic ol Switzerland, have invented certain new and useful Improvements in Selfcting Cutting and Polishing Machines for Cutting and Stones, dsc., (for which I have obtained Let ters Patent in France, dated July l, 1SS6,No. 177,126, and in Germany July al, 1886, No. 39,3113) and 'l do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to letters or figures of reference marked thereon,which form a part of this specification.

This invention has reference to machines for grinding and polishing precious stones and jewels; and it consists in the improved construction, hereinafter described and set forth in the specilication and claims, whereby the stones can be thoroughly ground and polished and all the necessary adjustments readily secured.

In the accompanying drawings, forming part of this specification, Figure 1 is a view in elevation, partly in section, on the line l 1, Fig.

2. Fig. 2 is an end view. Fig. 3 is a detail in elevation of the jewel-holding shank and stock. Fig. 3 is a section on the line 2 2, Fig. 3. Fig. 31 is an inverted sect-ion on the line 3 3 of Fig. 3. Fig. t is a sectional plan on the line l l of Fig. 1; Figs. 5 and 5a, respectively, a detail plan and side view of the stock-actuating wheel. Fig. 6 is an enlarged detail view of the stock and its connecting parts.

The supportingframe of the machine consists, principally, of the horizontal central portion, M, and the supportingstandards N N. At either side of the central supporting portion, H, is located a horizontal bed, 7, which is provided in its upper side with parallel dovetailed ribs 8, as clearly shown in Fig. 2. The upper and lower horizontal portions composing the central part of the frame M are recessed to form bearings for a vertical shaft,

Polishing Precious and Artificial shaft d, and imparts motion thereto through d, the lower end of which bears in the lower portion, M, while its upper portion extends above the upper bearing, and is threaded for the attachment by suitable burr-s, n, of a horizontal polishing or grinding disk, A. A watei'-rece1 )tacle, A, rests upon the upper portion, M, and surrounds the polishing-disk A. A pulley, b, is mounted to rotate with the the medium of a belt, 10, which passes round the driving-disk c, mounted on a shaft, F. (See Fig. 2.)

Upon each bed 7 rests a block, .1, the lower portion of which is dovetailed to engage the dovetailed ribs S, and be guided thereby in its movements back and forth upon the bed. The upperportion of each block J is pierced transversely to form the bearing for a horizontal shaft, D, upon which is keyed a bevel gear-wheel, C', and a grooved pulley, E. The ends 11 11 of the bifurcated portion 12 of the frame H are mounted on the shaft D, as clearly shown in Fig. 2, so that said frame will have a pivotal movement upon said shaft. The said frame l-l is provided with two bearings, 13 1i, in which is mounted a shaft, B, to the lower end of which is secured a bevel gear- .wheeh C, meshing with the gear-wheel C', the

relative position of the shaft D, gear-wheel C', frame H, and its shaft and gear-wheel being such that the pivotal movement of said frame H will not interfere with the engagement of said gear-wheels C and C', which are arranged eoncentrically with respect to each other.

Upon the upper end of the shaft B are mounted two disks, d e, the latter being of somewhat smaller' diameter. The under face of the disk e is provided adjacent to its periphery with a series of lugs, e while the under face of the disk d is provided adjacent to its periphery with a series of recesses, which form inclined shoulders d, as clearly shown in Fig. 5. A coil-spring, e, is disposed on shaft B between disks (l e and serves to hold 9 the latter in proper relation to each other.

The frame H is provided with two parallel arms, 15 15, which extend out at right angles and are each provided with a bearing, 15 16, arranged parallel with the bearings 13 1land adapted to receive the gem-holding tool and stock and parts more immediately connected therewith.

By reference to Figs. 3, 3, and 3" it will be noted that the stock proper, z', has a semicircular recess at its' lower portion,in which the upper portion of the gem-holdin g tool or shank 71, bears, the latter adapted to be rigidly locked in said recess by means of a cam-lever, fi', which is pivotally mounted on a bracket, i, located on the stock A curved rod, 2'3,.is connected at one enl to the upper portion of the cam-lever i and extends through a recess, t", in the stock and terminates in a threaded portion, i5, which is engaged by jam-nut i6. A coiled spring, il, embraces the rod '3 and tends to normally hold the parts in the position represented in Fig. 3a.

By reference to the Lipper sectional portion of Fig. 1 it willl be seen that the stock i' extends to a point within the upper bearing 15, and that said stock, in connection with an independent section, 17, is locked to a disk, n', by means of a tube, n, internally threaded to engage threads on the stock-section, and which extends through the upper bearing and carries a threaded portion at its lower part, which is engaged and locked by means of nuts m m. The upper end of the section 17 is always maintained in contact with the under face of the disk cl by means of a coiled spring, m, set between the lower bearing 15 and the nut m.

n is a disk resting on the upper bearing 16, and upon the flanged edge of a tubular portion of said disk is formed a series of projections, n, with which engage the projections e of disk e.

A disk, K, which is to be graduated, is mounted on the stock yz', and is designed to operate in connection with a lixed indicator, K. The arrangement of disk K and indicator K is omitted from the left-hand stock in Fig. 1.

. A curved segment, j', extends from each frame H, as shown in Fig. 1, and has a slot, f', concentric with the shaft D. A bolt, f2, extends through said curved slot, and is designed to be engaged by a nut-lock, g, in order to clamp the segment at any point of its concentric movement. Each block J has a depending lug, J', to which is connected a plate, J 2, which is provided .integrally with a rod, k, extending through a bearing, 18, on the bottom of the bed 7, and said rod k is provided on its outer end with a bifurcated por` tion, in which is journaled a roller, k. It will be noted that the bifurcation and roller are located just beyond the outer face of one of the vertical standards N.

L refers to a wheel having' on its rear face cam-shoulders, against which the roller 7e is normally caused to bear by means of a coiled spring, k, seated between the inner face of the vertical standard N and the bearing 18.

The wheel L is mounted to rotate on the shaft 19, bearing at the inner end in the standard N, and on the outer portion of said shaft is mounted a drive-wheeLL, having a grooved periphery to receive a belt, and an internal shoulder to frictionally engage a corresponding shoulder, 20, of the wheel L. These wheels L L are thrown into intimate relation by means of a clamp-nut, L', having inner engaging portions, 21, to enter grooves in the hub of the wheel L, while the central portion of said nut L is internally threaded to engage the threaded end of the shaft 1Q. The wheel L receives its motion from a drive-pulley, L", through the medium of a belt, 22.

Adjacent to each wheel L, and within the frame of the machine, is a shaft, G, supported in suitable bearings and having keyed on its inner end a grooved pulley, E', corresponding with the pulley E. Each pulley E is geared with th'e pulley E above by means of a chain belt, 23. Bearings 24 24 in the lower part of the central portion of the frame receive the spindles 25, which carry rollers 26, bearing against the chains, as shown in Fig. 1. The inner ends of the spindles are con nected together by means of a contracting spring, E, which serves to cause the spindles and their rollers to always exert the proper tension upon the chain belts. V

One of the shafts G receives its motion from a worm, F, which meshes with the gearwheel F on said shaft, and vsaid shaft Gis designed to be thrown into and out of operation with respect to the wheel E by means of a clutch, F, composed of two clutch-sections, one of which is rigidly secured to shaft G, while the other rotates with a sleeve connected` with the wheel E and moving freely upon the shaft G, except when thrown into engagement with the other clutch-section.

In operation the disks e d are employed, having a number of projections, e', and shouldersd corresponding with the facets to be imparted to the gem. The desired angle can then be given to the apparatus by means of the segment f and its clamping devices, the said segment being graduatcd'on one of its faces to admit of more precision in the adjustment. The object which is. to be ground or polished is cemented or otherwise fastened to the extremity of the tool 7i., and the latter is then clamped in the stock Iz'. The position of the stock and its tool is adjusted by means of the small disk K and indicator-pin K and then made fast to the tube or sleeve n by means of the two nuts m m.

The disk K and stock-shaft are connected together, so that before the shaft is rigidly clamped to the tube it can be rotated to any desired extent, the adjustment being regu lat-ed by any suitable graduations on the disk operating in connection with the pointer.

It', for example, eight p facets have to be ground, the disk-wheels d e of the corresponding devices are placed on their respectiveshaftand the machine set in motion. Each. block J and parts connected therewith m'akeone IOO IIO

motion to and vfro tor every facet,such motion being secured through the agency of the camwheel L and roller-shank lo, as will be readily seen. The Wheel d, Which can be regulated by the nut d. and spring e, presses with a gradually-increasing force on the stock and its tool by means of the inclined shoulders c After one-eighth of a revolution of the wheel (l the tool 7L and its stock rise to their first position in consequence of the pressure exerted by the spring m" and the movement is repeated on the second facet, and so on.

The projections e on the disk e, engaging similar projections, fn, on the disk n', thus cause the partial rotation of said disk, the sleeve, and its stock and its tool in bearings, suoli movement ceasing as the project-ion e clears the projection n. This movement gi ves one-eighth of a turn to the tool-stock and its tool at the same moment that the stock rises. One revolution of the shaft B therefore serves to grind the eight facets. If now the next row of `facets has to be ground in alternate position to the iirst and in a different angle, the apparatus is first to be set to the desired angle and the graduated disk K enables a proper adjustment ot', say, one-sixteenth of aturn to be given to the tool-stock, which latter is again clamped by the nuts fm m'.

I claiml. The combination, in a gein polishingand grinding machine, a main frame, a hinged adjustable frame, a Vertical stock or carrier in said hinged frame, connections, substantially as described, for intermittently depressing said stock and carrier, and apolishing-disk and its shaft mounted in the main frame, substantially as set forth.

*2. In a gem polishing` or grinding' machine,

the combination of a horizontal grinding-disk, devices for rotating it7 a block, J, a springpressed shank connected to said block .l and having a roller, a cam-Wheel, L, and a frame,

H, mounted on said block J and carrying a tool-stock, substantially as described.

3. In a tool grinding or polishing machine, the combination, with a horizontal rotating grinding or polishing disk, of the frames H, having the stocks and tools and cam-disks for intermittently depressing said stocks, pulleys E E', and chain belts 23, 'for driving said depressing disks and tension devices connnecting said chai n. belts, substantially as set forth.

4. In a tool grinding or polishing machine, the combination, with the horizontal rotatin g grinding-or polishing disk7 of the frame H, carrying the tool-stock and the tool and shaft B, having' disks d e, the disk (l being' provided with shoulders d and the disk e With projections e, and a disk, n', provided with shoulders n, substantially as described.

5. In amachine for grinding or polishing gems, the combination, with a horizontal rotating grinding or polishing disk, of a frame or carrier, a stock and tool mounted therein, and devices for actuating said stock and tool, a disk, K,mounted on said stock, and a fixed index or needle le substantially as set forth..

6. The combination, in a gem grinding or polishing machine, of a toolstock having an independent tool and a spring-pressed camleyer, f', substantially as set forth.

In testimony whereof l affix my signature in presence of two witnesses.

THEODOR BLUSTSCHLI.

Witnesses:

.lULiUs A. Bonner, ROBERT ROTH. 

